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Find the standard deviation of ten-member set Y. (1) the set

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Find the standard deviation of ten-member set Y. (1) the set [#permalink] New post 11 Jul 2004, 23:53
Find the standard deviation of ten-member set Y.


(1) the set is an arithmetic progression
(2) the first member is 10; the second is 12

Last edited by stolyar on 12 Jul 2004, 02:11, edited 1 time in total.
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 [#permalink] New post 12 Jul 2004, 00:40
Assuming you ment an arithmetic progression,
With both statements together you can have a clue about the dispersal.

So i say... C.
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 [#permalink] New post 12 Jul 2004, 04:26
ans is C ...


a) sayz arithmetic progression ... that could be from any nuber as the beginning number...

B) first =10 and the next 12 we don't know what could be the next and the next untill the last...

combining both we have the 10 -28 as the set and we can have the ans ...

hope that helps !

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 [#permalink] New post 12 Jul 2004, 06:50
I guess question asks to find SD.

Numbers are: 10, 12, 14, 16, 18, 20, 22, 24, 26, 28
Mean: 19

SD^2 = 2(81 + 49 + 25 + 9 + 1)/10 = 33
SD roughly 5.7
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 [#permalink] New post 12 Jul 2004, 08:21
jpv, on DS questions you are not required to give a final answer.
Don't waste your time.
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Re: SD3 [#permalink] New post 12 Jul 2004, 09:30
stolyar wrote:
Find the standard deviation of ten-member set Y.


(1) the set is an arithmetic progression
(2) the first member is 10; the second is 12


C
1 & 2 together defines the sample space
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 [#permalink] New post 17 Aug 2004, 17:15
Stolyar: What is the Official Answer? I got C. Combining Statement 1 and statement 2, you'll have all the params needed to find the SD
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Re: SD3 [#permalink] New post 17 Aug 2004, 19:21
stolyar wrote:
Find the standard deviation of ten-member set Y.


(1) the set is an arithmetic progression
(2) the first member is 10; the second is 12


What's a definition of arithmetic progression?
can it be that the numbers are simply n+2, producing:
10, 12, 14, 16, etc.
or, would n*1.2 also qualify, producing:
10, 12, 14.4, etc..

the answer to the second question determines the answer here
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 [#permalink] New post 17 Aug 2004, 19:43
In my opnion the answer is E.

I have a question, perhaps, it may sound crazy. Does arthemetic progression always mean an addition. Can it not be any formulae. In that case,

Statement A - does not give much of an info on what type of arthemetic progression.
Statement B- also does not provide any information on how the other numbers wud be.

Hence E. Correct me, if my understading on the the arthemetic progression is wrong.
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 [#permalink] New post 20 Aug 2004, 00:33
arsen/lastochka,

Arithmetic Progression:
Numbers in sequence that have a common difference.
Eg: 2, 4, 6, 8...
1, -3, -7, -10....
In general, a, a+d, a+2d, a+3d....

Geometric Progression:
Numbers in sequence that have a common ratio.
Eg: 2, 4, 8, 16...
1, -3, 9, -27....
In general, a, ar, ar^2, ar^3....

Geometric Progression:
Numbers in sequence that have a common reciprocal ratio (not sure of the term is correct)
Eg: 1/2, 1/4, 1/6, 1/8...
In general, 1/a, 1/a+d, 1/a+2d, 1/a+3d...
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 [#permalink] New post 20 Aug 2004, 06:41
hardworker_indian wrote:
arsen/lastochka,

Arithmetic Progression:
Numbers in sequence that have a common difference.
Eg: 2, 4, 6, 8...
1, -3, -7, -10....
In general, a, a+d, a+2d, a+3d....

Geometric Progression:
Numbers in sequence that have a common ratio.
Eg: 2, 4, 8, 16...
1, -3, 9, -27....
In general, a, ar, ar^2, ar^3....

Geometric Progression:
Numbers in sequence that have a common reciprocal ratio (not sure of the term is correct)
Eg: 1/2, 1/4, 1/6, 1/8...
In general, 1/a, 1/a+d, 1/a+2d, 1/a+3d...


that's exactly right. arithmetic progression always means common difference between the numbers in the set.
  [#permalink] 20 Aug 2004, 06:41
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